This paper aimed to investigate the attribute of the torsional behavior of concrete beams reinforced with steel fiber. The attribute of materials was investigated through 3-point loading bending tensile strength test and a test was conducted for the manufactured member with actual size. For the vari...
This paper aimed to investigate the attribute of the torsional behavior of concrete beams reinforced with steel fiber. The attribute of materials was investigated through 3-point loading bending tensile strength test and a test was conducted for the manufactured member with actual size. For the variables of the test of members, the members were divided into 1.0% steel-fiber content and 2.0% steel-fiber content and strupp content was classified into 0.0%, 0.35% and 0.70%. Also lastly, the content of longitudinal steel reinforcement was homogenized as 0.56% for all six members.
Experimental approach was based on ram displacement control using the actuator with the capacity of 1,000 kN and the displacement control rate of was loaded at 6.0 mm / min (= 0.1 mm / sec).
As a result of the test, in torsional test, all members showed inclined cracks. After the ultimate load, members showed the curves in the ductile state, not in the brittle state. And among a number of major inclined cracks before the ultimate load, the width of some specific cracks increased, and it develops into major inclined crack.
When steel-fiber content was 1.0%, the content of closed strupp steel reinforcement increased to 0%, 0.35%, 0.70%, and as a result, the ultimate torsional moment appeared as
73.3kN · m, 75.3kN · m, 86.7kN · m respectively, and when steel-fiber content was 2.0%, the content of closed strupp steel reinforcement increased to 0%, 0.35%, 0.70%, the ultimate torsional moment appeared as 66.1kN · m, 85.6kN · m, 109kN · m, respectively.
As a result of the comparison between the intensity and the experimental results based on Skew bending theory and Thin walled tube theory, Skew bending theory considering the torsional resistance of concrete is more close to the experimental results than Thin walled tube theory excluding the torsional resistance of concrete.
This paper aimed to investigate the attribute of the torsional behavior of concrete beams reinforced with steel fiber. The attribute of materials was investigated through 3-point loading bending tensile strength test and a test was conducted for the manufactured member with actual size. For the variables of the test of members, the members were divided into 1.0% steel-fiber content and 2.0% steel-fiber content and strupp content was classified into 0.0%, 0.35% and 0.70%. Also lastly, the content of longitudinal steel reinforcement was homogenized as 0.56% for all six members.
Experimental approach was based on ram displacement control using the actuator with the capacity of 1,000 kN and the displacement control rate of was loaded at 6.0 mm / min (= 0.1 mm / sec).
As a result of the test, in torsional test, all members showed inclined cracks. After the ultimate load, members showed the curves in the ductile state, not in the brittle state. And among a number of major inclined cracks before the ultimate load, the width of some specific cracks increased, and it develops into major inclined crack.
When steel-fiber content was 1.0%, the content of closed strupp steel reinforcement increased to 0%, 0.35%, 0.70%, and as a result, the ultimate torsional moment appeared as
73.3kN · m, 75.3kN · m, 86.7kN · m respectively, and when steel-fiber content was 2.0%, the content of closed strupp steel reinforcement increased to 0%, 0.35%, 0.70%, the ultimate torsional moment appeared as 66.1kN · m, 85.6kN · m, 109kN · m, respectively.
As a result of the comparison between the intensity and the experimental results based on Skew bending theory and Thin walled tube theory, Skew bending theory considering the torsional resistance of concrete is more close to the experimental results than Thin walled tube theory excluding the torsional resistance of concrete.
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